Extremely poor performance crunching random numbers under PIV-FC5
Andy Green
andy at warmcat.com
Fri May 19 07:19:22 UTC 2006
> It is surprising that when the program is compiled with the static
> flag enabled, it runs very fast, doing 10 million calculations in only
> 0.4 seconds. Nevertheless, when it is compiled without the static flag
> (that is dynamic binary), the performance becomes very poor, consuming
> 40 seconds in doing it.
>
> This sure looks like an intel CPU problem.
Yes but he says:
''I have tested both compilations under other Linux distributions, like
Debian, and it runs in both case perfect, doing the job in only 0.4
seconds. I have also tested both programs under FC3 and I obtain the
same results than FC5. So I conclude that the problem only happens
when running Fedora! ''
It looks like the problem may belong to either (kernel/glibc?) patches
or configuration options specific to Fedora.
-Andy
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